i recently purchased a Nikon D5000 DSLR, it came with the 18-55VR lens and i bought the 55-200VR as a secondary lens.

I have been in Jersey all week taking photos of animals, general holiday snaps and a friends wedding. Was finding myself caught out at times and needed to swap lenses, which was annoying me.
Is it worth getting an all in one lens? im looking at Nikkor 18-200 VR lens or Tamron 18-270 VR Lens.

is the quality close of an all in one? and which to buy